American Tower Corporation was formed in 1995 as a division of American Radio Systems. The company spun-off that division in 1998 after merging with CBS Corporation.
Today American Tower is a tower management company that operates 27,700 broadcast and wireless communications towers. The company rents space on towers to clients such as AT&T, Sprint Nextel, and Verizon. Other clients include radio and TV broadcasters.
American Tower Corporation also operates rooftop antenna systems in the United States, Asia, and Central and South America.
The company trades publicly on the New York Stock Exchange under the ticker symbol AMT, is a member of the S&P 500, is #676 in the Fortune 1000, is #329 in the FT Global, has 2,716 employees, and had $4 billion in revenue in 2013.